Use the point-slope form of the equation of line y – 8 = 7(x + 3) to identify a point the line passes through and the slope of the line. slope: 7 point: (-3, 8) slope: 7 point: (3, 8) slope: 7 point: (8, 3) slope: 7 point: (8, -3)

Lets rewrite this into point-slope, y=mx+b.

y-8=7(x+3)
y-8=7x+21
y=7x+29

Now we can find the slope, which is 7. Now, because this is a linear line, we can substitute points to find which answer is correct. 

Option A)

(8)=7(-3)+29
8=-21+29
8=8 TRUE

Option A is correct, 
slope: 7
point: (-3, 8)

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.